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Empty steam traps, no internals. Why?
My wife and I bought a property last year which used to be a very small school when first built. The steam boiler is a little oversized but hasn't been running for the 20 years as the builds been empty. I've been going over the whole system and came across a strange issue. All the radiators (15 cast iron two pipe) have empty steam traps. By that I mean, when you remove the top, there is nothing inside apart from the hole back down the the condensate line. I can't see how the system would run efficiently like this, as how would it hold the steam in the radiators to warm them and give the steam chance to condensate. Seems like the steam will just run in to the condensate line and you would lose massive amounts of energy?
Is this something you would do, to long term winterize the system so not to get moisture trapped in the radiators and corrode them over time? Or maybe someone was going to turn the system into hot water? Any ideas?
At this point if I needed to install new steam trap internals I'm guessing I have to buy the whole valve body as well or are you still able to get the equivalent replacement internal cartridges? Any help appreciated.